The Burj Khalifa uses some 150 megawatts of power, equal to about a tenth of the output of the world's biggest nuclear reactors

The Burj Khalifa, the tallest tower in the world, with a height of 828 metres (2,717 ft), is seen in Dubai July 5, 2011. The natural desire to keep cool and entertained in the Gulf's hostile climate has helped make the United Arab Emirates one of the world's top five power consumers per capita while emissions of climate-warming carbon from Emiratis are more than twice those of U.S. citizens. The Burj Khalifa uses some 150 megawatts of power, equal to about a tenth of the output of the world's biggest nuclear reactors in a region that relies almost entirely on fossil fuels.